"Pretty In Soon" is a story about a girl, who accidentally killed a person. Park In Soon accidentally killed another girl when she was in high school. After serving her time in prison, she tried to rebuild her life but was unsuccessful due to her criminal record. She was encouraged by her high school teacher but feeling down and out, In Soon decided that her life wasn't worth living and attempted to commit suicide by jumping off the train track. Just then she was stopped by Yoo Sang Woo, her childhood friend who had moved to Canada before the incident. Through a series of events, In Soon was reunited with her mother, the famous actress Lee Sun Young who abandoned her soon after her father passed away. Can In Soon finally begin a new life and find happiness?